This paper introduces briefly the present internal and external state of drilling machining methods, drill material, new technology for making drills and some new types of deep hole making drills.

介绍了当前国内外钻削加工的方法、钻头材料、制造钻头的新工艺及一些新型的深孔加工钻头。

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Peter shouted for help because he knew the hole meant that the sea was making its way through the sea wall, but no answer came.

彼得知道这个洞意味着海水正在穿过海堤，所以他大声呼救，但没人应答。

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So Leonhardt and Pendry imagined bending space to steer light around a circular region, making anything inside that hole invisible.

因此，莱昂·哈特和彭迪设想，通过弯曲空间来引导光绕过圆环，从而使位于圆环中的所有东西都隐身。

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you make a little hole, and go in with an instrument instead of making an incision.

医生会先打开一个小孔，将仪器伸进去。而不是像以前一样做一个切口。

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He moved the ball forward and his third left him eight foot from the hole, making the putt for a valuable par.

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But if the masters of the universe disappear into a black hole of their making, don't ask the poor and prudent to ride to the rescue.

ECONOMIST: No demographic time bomb

First, we have already taken action to avoid making the hole any deeper.

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